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Figure 2 Diagram illustrating the π—π, C—H⋯π and C—H⋯O interactions (dotted lines) in the crystal structure of (I). Cg denotes a ring centroid. The disordered component of the butyl group, part B, has been omitted for clarity as have H atoms not involved in intermolecular contacts. Symmetry codes: (i) x + 1, y + 1, z; (ii) −x, 1 − y, −z; (iii) −x + 1, −y + 1, −z + 1; (iv) −x + 1, −y + 2, −z; (v) x − 1, y − 1, z. |